. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 373 this circlet is another of 6 larger papillae, 36 to 44//, long. Cuticle grossly annulated except in the middle of the body. Head end rounded: mouth opening round; mouth cavity narrow and tubular, 110/x to 175//. long (fig. 434a). Male 18 to mm. long by to 2 mm. wide. Esophagus 6 to 10 mm. long. Bursal cup (fig. 434 c and (/) almost trumpet-shaped, 275 to 320//. long by 260 to 360//, wide; it is often not in the direct body line but curved dorsally; its margin is more or less scalloped. Spicule almost
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 373 this circlet is another of 6 larger papillae, 36 to 44//, long. Cuticle grossly annulated except in the middle of the body. Head end rounded: mouth opening round; mouth cavity narrow and tubular, 110/x to 175//. long (fig. 434a). Male 18 to mm. long by to 2 mm. wide. Esophagus 6 to 10 mm. long. Bursal cup (fig. 434 c and (/) almost trumpet-shaped, 275 to 320//. long by 260 to 360//, wide; it is often not in the direct body line but curved dorsally; its margin is more or less scalloped. Spicule almost 8 mm. long (in Microtetrameres inflata mm. long, according to Linstow).. Figs. 432-433.—Eustrongylides mergorum. 432, a, Female ; b, male ; natural size ; c, head. After Linstow, 1877. 433, a, Front view and 5, lateral view of head; c, egg. After. Jaegerskiold, 1909 Female 25 to 36 mm. long by 2 to mm. wide (it probably be- comes as long as male or longer). Esophagus 8 to 12 mm. long. Posterior end bluntly rounded (fig. 4345). Vulva close to anus. Eggs 60 to 70//. long by 33 to 38//, wide, with blunt ends and pitted shells. Life history.—Unknown; see E. tubifex, p. 367. Distribution.—Europe. EUSTRONGYLIDES PAPILLOSUS (Rudolphi, 1802) Jaegerskiold, 1909 Synonyms.—Strongyl/us papillosus Rudolphi, 1802, part; Eustron- gyhis papillosus (Rudolphi, 1802) Diesing, 1851, part; Ilystnchis papillosus (Rudolphi, 1802) Molin, 1861, part. Hosts.—Primary: Anas boschas domestica, Anser cinereus domes- ticus, and Nuecifraga caryocatactes; secondary: Probably fish; see E. tubifex, p. 367, and E. igrnotw, p. 371. Location.—In tubercles in the esophagus. Morphology.—Eustrongylides (p. 367) : Body not enlarged in the middle portion, according to Jaegerskiold; Linstow says it is thick- ened. Mouth with the usual 2 circles of 6 papillae each about it. as in most other species of this Please note that these images are extracted from scanned page images that may have bee
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